package filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import vo.User;

/**
 * Servlet Filter implementation class Myfilter
 */
//@WebFilter(urlPatterns = { "/shixun/*" })//拦截路径
public class Myfilter implements Filter {

    /**
     * Default constructor. 
     */
    public Myfilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;     
		HttpSession session = req.getSession();
		User user = (User)session.getAttribute("user");
        String path = req.getServletPath();
        //System.out.print(path+"\n");
        if(user == null){
        	res.sendRedirect("../filter/Login.jsp");
        	//request.getRequestDispatcher("Login.jsp").forward(request, response);
        	return;
        }else{
        	//System.out.print("成功\n");
        	chain.doFilter(req, res);//放行
        }
		// pass the request along the filter chain
		//chain.doFilter(request, response);
}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
